{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:J5CRVWQMSCKFUIH34MOGHH7MWN","short_pith_number":"pith:J5CRVWQM","canonical_record":{"source":{"id":"1807.11616","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-07-31T00:31:34Z","cross_cats_sorted":[],"title_canon_sha256":"5cfccdca39426f3a799d29981bef13fdce639ebfc94b95e00a95dee10557c0c0","abstract_canon_sha256":"888a0789ed72d8bc41745f62a820144ac2d97575475acc481a2d61ce8e398abd"},"schema_version":"1.0"},"canonical_sha256":"4f451ada0c90945a20fbe31c639fecb35349a8e08befa74015fa4eb7fb211680","source":{"kind":"arxiv","id":"1807.11616","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.11616","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"arxiv_version","alias_value":"1807.11616v4","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.11616","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"pith_short_12","alias_value":"J5CRVWQMSCKF","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"J5CRVWQMSCKFUIH3","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"J5CRVWQM","created_at":"2026-05-18T12:32:31Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:J5CRVWQMSCKFUIH34MOGHH7MWN","target":"record","payload":{"canonical_record":{"source":{"id":"1807.11616","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-07-31T00:31:34Z","cross_cats_sorted":[],"title_canon_sha256":"5cfccdca39426f3a799d29981bef13fdce639ebfc94b95e00a95dee10557c0c0","abstract_canon_sha256":"888a0789ed72d8bc41745f62a820144ac2d97575475acc481a2d61ce8e398abd"},"schema_version":"1.0"},"canonical_sha256":"4f451ada0c90945a20fbe31c639fecb35349a8e08befa74015fa4eb7fb211680","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:54:31.663124Z","signature_b64":"DGpRjkPDghMNt1YbJFLHhdgxjXX4j3EFAmHgeKQZYsAmyraY9QqND29IThiJ12IhGKp8YAJzIREnE65Cn14cAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4f451ada0c90945a20fbe31c639fecb35349a8e08befa74015fa4eb7fb211680","last_reissued_at":"2026-05-17T23:54:31.662515Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:54:31.662515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.11616","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:54:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mJFeYKxviNTGdsirRxSs6luXveMcwRutiMZN1XkcZhaO8JstjOsnBdCBhVbYQSUk66+seBd+Ht0TPdx0R0n2AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T01:27:13.751171Z"},"content_sha256":"5342816edc83383914d4f4c4da3c58ac9ed9118eeae15c723c14da3300e012b7","schema_version":"1.0","event_id":"sha256:5342816edc83383914d4f4c4da3c58ac9ed9118eeae15c723c14da3300e012b7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:J5CRVWQMSCKFUIH34MOGHH7MWN","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"NSPT estimate of the improvement coefficient $c_A$ to two loops","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-lat","authors_text":"Christian Torrero","submitted_at":"2018-07-31T00:31:34Z","abstract_excerpt":"By using Numerical Stochastic Perturbation Theory (NSPT), we carry out a quenched two-loop computation of the improvement coefficient $c_A$ associated to the isovector axial current. Within the Schr\\\"odinger Functional formalism, we compute the bare quark mass $m$ and fix $c_A$ by requiring discretization corrections on $m$ to be of order $O(a^2)$ in the lattice spacing $a$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.11616","kind":"arxiv","version":4},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-17T23:54:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"NV67aX4ooGhBw4Wuh0WqZOVkLxVB09XXwtT6T0uXsUn36LHtDFpq0mVgKbDaNJEI2auKSBA5fr2tueuobHipAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T01:27:13.751801Z"},"content_sha256":"df26985f33c8d4d0b87d5bc976b26056d9f8dfce27bf22df663e875177ef9888","schema_version":"1.0","event_id":"sha256:df26985f33c8d4d0b87d5bc976b26056d9f8dfce27bf22df663e875177ef9888"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/J5CRVWQMSCKFUIH34MOGHH7MWN/bundle.json","state_url":"https://pith.science/pith/J5CRVWQMSCKFUIH34MOGHH7MWN/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/J5CRVWQMSCKFUIH34MOGHH7MWN/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T01:27:13Z","links":{"resolver":"https://pith.science/pith/J5CRVWQMSCKFUIH34MOGHH7MWN","bundle":"https://pith.science/pith/J5CRVWQMSCKFUIH34MOGHH7MWN/bundle.json","state":"https://pith.science/pith/J5CRVWQMSCKFUIH34MOGHH7MWN/state.json","well_known_bundle":"https://pith.science/.well-known/pith/J5CRVWQMSCKFUIH34MOGHH7MWN/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:J5CRVWQMSCKFUIH34MOGHH7MWN","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"888a0789ed72d8bc41745f62a820144ac2d97575475acc481a2d61ce8e398abd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-07-31T00:31:34Z","title_canon_sha256":"5cfccdca39426f3a799d29981bef13fdce639ebfc94b95e00a95dee10557c0c0"},"schema_version":"1.0","source":{"id":"1807.11616","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.11616","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"arxiv_version","alias_value":"1807.11616v4","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.11616","created_at":"2026-05-17T23:54:31Z"},{"alias_kind":"pith_short_12","alias_value":"J5CRVWQMSCKF","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_16","alias_value":"J5CRVWQMSCKFUIH3","created_at":"2026-05-18T12:32:31Z"},{"alias_kind":"pith_short_8","alias_value":"J5CRVWQM","created_at":"2026-05-18T12:32:31Z"}],"graph_snapshots":[{"event_id":"sha256:df26985f33c8d4d0b87d5bc976b26056d9f8dfce27bf22df663e875177ef9888","target":"graph","created_at":"2026-05-17T23:54:31Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"By using Numerical Stochastic Perturbation Theory (NSPT), we carry out a quenched two-loop computation of the improvement coefficient $c_A$ associated to the isovector axial current. Within the Schr\\\"odinger Functional formalism, we compute the bare quark mass $m$ and fix $c_A$ by requiring discretization corrections on $m$ to be of order $O(a^2)$ in the lattice spacing $a$.","authors_text":"Christian Torrero","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-07-31T00:31:34Z","title":"NSPT estimate of the improvement coefficient $c_A$ to two loops"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.11616","kind":"arxiv","version":4},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:5342816edc83383914d4f4c4da3c58ac9ed9118eeae15c723c14da3300e012b7","target":"record","created_at":"2026-05-17T23:54:31Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"888a0789ed72d8bc41745f62a820144ac2d97575475acc481a2d61ce8e398abd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"hep-lat","submitted_at":"2018-07-31T00:31:34Z","title_canon_sha256":"5cfccdca39426f3a799d29981bef13fdce639ebfc94b95e00a95dee10557c0c0"},"schema_version":"1.0","source":{"id":"1807.11616","kind":"arxiv","version":4}},"canonical_sha256":"4f451ada0c90945a20fbe31c639fecb35349a8e08befa74015fa4eb7fb211680","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4f451ada0c90945a20fbe31c639fecb35349a8e08befa74015fa4eb7fb211680","first_computed_at":"2026-05-17T23:54:31.662515Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:54:31.662515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DGpRjkPDghMNt1YbJFLHhdgxjXX4j3EFAmHgeKQZYsAmyraY9QqND29IThiJ12IhGKp8YAJzIREnE65Cn14cAg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:54:31.663124Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.11616","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5342816edc83383914d4f4c4da3c58ac9ed9118eeae15c723c14da3300e012b7","sha256:df26985f33c8d4d0b87d5bc976b26056d9f8dfce27bf22df663e875177ef9888"],"state_sha256":"af585b453bf0526aaa91cf6b2ba71c871e407c8cc49426e96ccb8bafa2e78386"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"oUMB/8qRss9NxxcanKB+jY5BhxAOWc0gSEahcpkVu6HmvPmykyQwJ41aWvg9GS8GLzFJTg1554NNPZ/dvqZvDw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T01:27:13.755197Z","bundle_sha256":"46ea3cb9733d0d2d64bdc425e1a774983e44d4b258f0eee24aae5f3db54e001c"}}